The technique is rather complex, but it involves dividing the sample up into small fragments called “grains”. So if a recorded sample was 5 seconds long, we can play it back at a higher or lower pitch, but the played sample will still have a duration of 5 seconds. It’s easy to change the pitch of a sample by playing it slower or faster, but granular synthesis allows you to alter the pitch without changing duration of the sample. This project uses a technique called granular synthesis, to raise and lower the pitch of a sample. This Audio Hacker example shows how you can manipulate audio to radically change recorded samples.
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